Learn Finnish: Kyllä sinä läpäiset ajokokeen. - You will certainly pass the driving test.

In this sentence, kyllä acts as an epistemic adverb, which is a word used to show how certain the speaker is about their statement. Instead of meaning 'yes', it adds strong conviction to the statement, translating to 'certainly', 'surely', or 'I am sure that'. It is used here to reassure the listener.

Could I place kyllä somewhere else, such as Sinä kyllä läpäiset ajokokeen?

Yes, you can. Placing kyllä at the very beginning of the sentence puts the maximum emphasis on your certainty. Saying Sinä kyllä läpäiset ajokokeen is slightly softer and very natural in casual speech, but it still carries the same reassuring meaning.

Why is ajokoe (driving test) in the genitive/accusative form (ajokokeen) instead of the partitive?

Passing a test is a bounded, complete action with a clear end result. Because the action of passing is seen through to its successful completion, the noun takes the total object form (which looks exactly like the genitive here) rather than the partitive.

The English translation says 'will pass', but läpäiset is in the present tense. How does that work?

Finnish does not have a dedicated grammatical future tense. Instead, it uses the present tense verb combined with the total object (ajokokeen). This combination of a present tense verb and a completed action on the object is the standard way to express that something will be finished in the future.